Automatic alarm time-clock.



G. B. STARR.

AUTOMATIC ALARM TIME 0 APPLICATION IILBD JAN.

LOCK.

Patented. Aug. 25, 19M

WITNESSES:

sh nit 3 UNITED STATES PATEN T OFFICE.

GEQRGE B. STARR, OF OAKLAND. CALIFORNIA, ASSIGNOR 0F ONE-HALF T0 0. J.MEADS, I

OF OAKLAND, CALIFORNIA.

AUTOMATIC ALARM TIME-C1400.

- Application filed January 21, 1913.

Specification of Letters Patent.

Be it known that l, Gnonon B. STARR, a citizen of the United States,residing at Oakland, in the county of Alameda and State of Jalifornia,have invented new and useful IIJPIOVGIHGIHZS in Automatic AlarmTimeClocks. of which the following is a specification.

This invention relates to an automatic timer which can be setto run adefinite period of time, and to notify the operator at the expiration ofthat time.

The invention has been particularly applied in practice in keeping trackof time in cooking eggs, etc., having been successfully used as anautomatic alarm egg timer. Manifestl however, it is capable of generaluse wherever lapsed time is to be kept track or".

The invention consists of the parts and the combination and constructionof parts as hereinafter more fully described and claimed, havingreference to the accompanying drawings, in which Figure 1 is a frontelevation of the apparatus. Fig. 2 is a front elevation of the operatingmechanism. Fig. 3 is a plan View of Fig. 2. Fig. 4 is a detailverticalsection on line X-X, Fig. 3. Fig. 5 is adetail vertical section on lineY-Y, Fig. 3. Fig. (I- is a detail perspective view of the locking andreleasing mechanism.

A is a dial which may be graduated by minutes and fractions thercoi orother desircal subdivisions of time.

2 is an indicator or hand traveling over the dial. This indicator ismounted on a which is acted on by the main spring: 4- and adapted to beturned against the tension of said spring by suitable means, as the key5. Shaft 5 carries a mutilated gear c constructed and arranged, when theshaft 5-? has been turned against the tension of its spring apredetermined distance, to engage a gear 7 arranged in the alarm systemafter the following manner: llcar 7 is mounted loose on What I shallterm the alarm shaft 8, Which latter may be wound. against the tensionof its spring 9. 10 is a ratchet wheel fixed on shaft 8 and operated onby a, spring-pressed pawl 11 on the loose gear 7. Turning the key 5 tothe left to wind up spring 4 also turns the l'llutilatcd gear 6, whichlatter when it engages with the loose gear 7 W111 lock gear 7 to shaft 8'If for instance the device is l l l l its pawl ll and ratchet 10, toturn the alarm shaft 8 against the tcnsion of its spring 5) to wind thealarm mcclmnism.

The alarm mechanism -which I have shown comprises in addition to theforegoing parts, the following train of gears 12 is a loose gear onalarm shaft 8 carrying the pawl 13 adapted to engage a ratchet 14 fixedon alarm shaft 8. Loose gear 12 engag a pinion 15 on a counter-shaft 16,which latter carries a spur gear 17 which operates the alarm lever inthe manner Well known in the art.

Lever 18 carries a. hammer 19 to sound the bell 20.

In addition to the indicator hand main shaft 3 carries a trip finger 21ed to engage a bell a spring detent 23 path of the alarm lever 18. Thealarm can not go off until the 2, the adaptcrank 22, which operates torelease the arm.-

he operation of the device is as follows: used as a, timer forindicating the length of time an egg is to be boiled, the key 5 with theindicator hand standing at zero is turned to the left to the pointmarked 3 minutes on the dial, or such other time for which the egg is tobe boiled, at the same time the article is deposited in the hot Water.This turning of the key Winds up the mechanism. Immediately on therelease of the key the mechanism acting under the tension of the mainspring 4, governed by the usual escapernent and balance common in clocksand not necessary here to be shown or described, the hand 2 graduallymoves backward over the dialv until the indicator or hand 2 returns tozero. Simultancously with the return of the indicator to zero the tripfinger 21 on hait engages the bell cran: 22 and operates the springdetent. 23 to release the pressure on the alarm lever 18. Since the,alarm mechanism now free to turn, the mutilaled gear having turned backso that there are no teeth on it engaging the companion gear 7, thealarm will operate by the reason of the energy stored in the spring 9;the mutilated portion of the gear 6 allowing the gear 71o turn free. Bythis construction the indicator 2 nonnally stands at the zero mark onthe dial, which point is the initial point from which time is computed.\Vhcn the clock is set it is set with reference to the initrip finger21' engages the bell crank and moves the spring detent I normallydisposed in the i tisl position of the indicator and. when the indicatorreturns to initial position alarm is released and 1101;; before, The

5 eperates t0 turn theiiidiceter iii one direc 5 tion and the spring toreturn it t initial position; there heingne catches on the main shaftthe letter begins its return movement imnieclietely'on the release ofthe key and the spring is Weuricl only EuLilC lQlfll] to run the timertor the particular period of time of three minutes, or three hours, orWhatever other time the timer is set for.

Having this described myinventien, What '1 claim and. clesirete secureby Letters Patent is:

1. In an automatic e'lsriii timer zi'spriiig ctiietecl Winding shaft,alarm mechanism, means to hold" the alarm inoperative means whereby'epera'tioii of the Winding shaft Windsseicl elerm mechanism, including amember which is isengegecl from the alarm "mechanism after i the windingshaft has mew/"ed a, predetermined distance, and means operated by theWinding shaftto releasethe alerrii mechanism liolc M g means seer(liseiige'g'eme it of seid'meiiiber from the alarm meeheiiishiff v '5:2. In an zilite h(itie alarm timer e Winding shaft, zilslriii mechanismmeans t0 hold the 39 alarm inoperitive, means operative by said.

actuated winding shaitt, a mutilated gear on seicl shaft, alarmmechanism including a spring actuated alarm shaft and. a hammer carryinglever, means for winding the alarm shaft from the gear, a trip fingercarried by said winding shaft, a bell crank arranged. to have 'e'sie armthereof engaged by said trip finger, a spring detent normally (lisposeclin the path of the hammer carrying lever, and means carried by the otherarm of the hell crank to actuate said detent to releasethehammerearryingtlever after the In testimony whereof I have hereuntoset my hand the presence of two subscribing Witnesses.

" GEORGE B. STARR.

WY thesses i geer has been disengaged from the winding

